Pneumatic tool dresser



R. A. SHILSON 2,631,479

PNEUMATIC TOOL DRESSER March 1 7, 1 953 Filed April 28, 1950 2SHEETS-SHEET l 45 HIIIIIiiiiiii;

Wilma FIGI I I z 'd Ram a ymon zfson 2 SHEETS-SHEET 2 March 17 1953 R.A. SHILSON PNEUMATIC 'IIOOL. DRESSER Filed-April 28, 1950 v I N IInventor Rqymond (Z-55215023 Patented Mar. 17, 1953 UNITED STATES mOFFICE PNEUMATIC TOOL DRESSER Raymond A. Shilson, Steep Rock Lake,Ontario, Canada Application April 28, 1950, Serial No. 158,835

2 Claims. (Cl. 76-5) My invention relates to pneumatic tool dressers,morespecifically, to a pneumatic tool dresser of the characterherewithin described, an object of which is to provide a pneumaticallyoperated device for dressing pneumatic drills, to replace the presentlaborious method of dressing such drills manually.

A further object of my invention is to provide a device of the characterherewithin described which is capable of being adjusted to give uniformtreatment, such as direction of hammer blow, intensity, duration, andthe like qualities of the dressing operation, hitherto dependent solelyupon the experience and skill of the operator.

A still further object of my invention is to provide a device of thecharacter herewithin described whichwill, because of its rapidity andeficiency, enable the operators to increase the output of drill bits,thus contributing to the increased overall operational efiiciency of thepneumatic hammer or drills.

Yet another obj ect of my invention is to provide a device of thecharacter herewithin described which utilizes the same power source andthe same mechanical principles as the pneumatic drills and hammers, thusfacilitating its use Without additional prime movers or operating skillsthan would be readily available for the aforementioned tools.

A And another object of my invention is to provide. a device ofthecharacter herewithin described which i relatively economical tomanufacture and operate, and otherwise very well suited to the purposefor which it is intended.

With the foregoing objects in view, and such other objects andadvantages as will become apparent to those skilled in the art to whichthis invention relates as this specification proceeds, my inventionconsists essentially in the arrangement and construction of parts all ashereinafter more particularly described, reference being had to theaccompanying drawings in which:

Figure 1 is a side elevation of my invention as it would appear inrelation to the work upon which it is to function, also shown therein.

Figure Z is a top plan view of my invention, again with the work alsoshown in situ thereupon.

Figure 3 is a perspective, fragmentary view showing the connectionbetween the hammer and supporting tube.

In the drawings like characters of reference indicate correspondingparts in the different figures.

The procedure commonly practiced for maintaining heavy drill bitsinvolves hand forging of the said bits, which, because of the relativelyheavy pieces upon which work must be done, means that a crew of men isrequired to handle each bit in rotation. With this time and energconsuming feature in mind, my invention was developed so that oneoperator can do the work of several, and still produce a refinished toolbit which is more uniform in geometrical characteristics, and in itsquality than tool bit refinished by the conventional manual method incommon practice.

The entire assembly is supported upon a bed I, fabricated of standardheavy rolled steel bed rails IL and IB, mounted upon a length of heavytiniber 2. The forward end of this bed is an essentially verticalbuilt-up member 3, the upper end of which is of V-configuration, thuscentering any cylindrical bit shank that may be set there in; the lowerend of said member straddles the timber 2, and is secured thereto. Aback plate 3' is provided against which the rear end of a drill bit mayregister, thus acting as an anchor for preventin rearward movement ofthe drill bit during dressing.

At a distance approximately equal to the length of a drill bit,rearwards from the forward end hereinbefore described, a second V block4 is mounted upon a relatively heavy block- 5, which serves as an anvil,and upon which the drill bit end to be dressed is rested. Drillings areprovided in the bed anvil guides 6 to vary the position of this anviland V block assembly to adjust for varying lengths of drill bits.

A table I fabricated of rolled steel sections is rigidly mounted uponskids 8, thus enabling the said table to be slidably moved along the bedin either forward or rearward direction, as desired. A series ofdrillings at intervals in the horizontal flanges of the bed rails IL andR. provide attachment for said skids 8 which are also drilled at eachend for bolts, which fix the table upon the bed rails.

A heavy gauge steel plate 9, rigidly attached to aforesaid table 'l,supports the device proper.

A conventional pneumatic cylinder and piston assembly In equipped withhose II' to connect it with a source of compressed air, and conventional control valve i2 is mounted upon an angulated supportingstructure described hereinbelow.

The said cylinder is provided with a hammer head l3 having a strikingface l3 of rectangular configuration slideably engaging the end of thecylinder and adapted to bestruck by the piston (not illustrated).Loosely connected to said hammer head, a return spring 14 is provided toreturn the hammer head after each piston stroke in readiness for thenext impulse. After making a turn about pin [5, the other ends of springM are anchored against abutment rod l6 which is fixed to the undersideof spring support bracket The said spring support bracket l! is afabricated, right-angled bracket which is supported at the breech end ofthe pneumatic cylinder [0, upon the lower ends of recoil rods l8.

The ends of the said rods I8 are screw-threaded to receive nuts I9.Recoil springs 29 are fitted upon the said rods l8 and bear upon aflange 2 I' which is a fixture of the pneumatic cylinder, and upon sprinsupport bracket I! which is thus retained upon aforesaid recoil rods byclamping pressure between nuts l9 and recoil springs 20.

The pneumatic cylinder Ill itself is rigidly attached to, and supportedupon, a frame comprising elongated tubular members 22 and 23, whichextend from lower end fittings 24 in close proximity to the springsupport bracket I? upward to upper fittings 25. Two lengths ofcylindrical tubing are fitted below along and parallel to, theaforementioned tubular members 22 and 23, and supported in theaforementioned end fittings 24 and 25 and comprise tubular guides 25 and21.

Telescoping into the aforesaid tubular guides 26 and 21, slides 28 and29 extend, and support crank end fitting 3B. This fitting is maintainedin position by means of a third rod 3! which is secured to said crankend fitting 3s and slidably to end fittin 25. A bushing 32, centrallydisposed in crank end fitting 30 which is apertured correspondingly,journals a screw-threaded, crank arm ended, feed screw 32'. Thearrangement just described permits the axial adjustment of the pneumaticcylinder as a Whole towards or away from the anvil-mounted drill bit byreciprocation of the tubular members 22 and 23 upon slides 28 and 2! therod 3| reciprocating through end fitting 25.

To provide transverse adjustment, the hereinbefore described feed screwequipped mounting is supported upon a short tubular member 33 by meansof a clamp assembly 36 extending from the web 35 between the two sidemember tubes 22 and 23. Clamping bolt 36 and nut 3'! secure thepneumatic cylinder mounting structure to the supporting tubular member33. Thi member then is free to run between two sets of upper and lowerrollers 39 and 40 transversel across table top 9. The rollers 33 and 4Bare journalled for rotation within a pair of U brackets 4! secured toand upstanding from the table top 9. Actuating lever 42 of the secondorder is bracketted 43 to the support cylinder 33, and is pin connectedthereto by pin 44.

An extension 35. of bed plate 1! bears a fulcrum pin 39' upon which saidlever hinges. The operator may then move the cylinder mounting, togetherwith the piston and hammer, to and fro across the face of the drill bitto be dressed, during the operation of the hammer.

A single inverted U bracket 45 angulated so as to be perpendicular tothe axis of the pneumatic cylinder is rigidly attached to the bed plate9, and serves to provide support for the feed screw mounting at itslower end.

The associated drill bit at that is to be dressed is mounted within theV block 4 and the rear 4 member 3, the former being positioned withinthe bed as hereinbefore described.

The assembly is located along guides IL and IR to bring the hammer head[3 within range of the drill bit head 41. Relatively fine adjustment ofthe position of the hammer head I3 is obtained by the aforementionedfeed screw 32, thus causing the cylinder [0 and the tubular members 22and 23 to move along members 29 and 3|.

Compressed air is now fed to the cylinder l0 thus causing the hammerhead l3 to reciprocate rigidly against tension of spring 14 thusstriking the inclined face 4-8 of the drill bit. At the same time lever42 is actuated thus causing the assembly to move transversely acrosstubular member 33 thereby causing head l3 to strike the face E8 of thedrill bit across the width thereof. The

drill bit is then turned through and the opposite side of the bit isdressed in a similar manner.

In conclusion it will be noted that the angular relationship of theassembly to the face 48 .of the drill bit can be adjusted, if necessary,by the aforementioned clamping bolt 36 which secures the assemblyrigidly to tube 33 although in this connection it will be appreciatedthat the front support bracket 45 will have to be varied in height tocompensate for this adjustment.

Since various modifications can be made in my invention as hereinabovedescribed, and many apparently Widely different embodiments of same madewithin the spirit and scope of the claims without departing from suchspirit and scope, it is intended that all matter contained in theaccompanying specification shall be interpreted as illustrative only andnot in a limiting sense.

What I claim as my invention is:

1. An assembly for dressing mining drill bits and the like comprising incombination, a supporting bed, a table secured to said bed, a cylinderinclinably mounted upon said table, a piston reciprocal within saidcylinder, a hammer head extending from one end of said cylinder, areturn spring extending between said hammer head and said cylinder, ananvil also mounted upon said bed for supporting an associated drill bitto be dressed, adjacent said hammer head, anchoring means to preventlengthwise movement of said drill bit during dressing, and means toprovide relative transverse movement between said hammer head and thehead of said bit, said means including a pair of U brackets extendingupwardly from said table, a supporting tubular guide journalled fortransverse movement within said U brackets, a clamp assembly extendingbetween said tubular guide and said cylinder, and means to move saidsupporting cylinder Within said U brackets.

2. An assembly for dressing mining drill bits and the like comprising incombination, a supporting bed, a table secured to said bed, a cylinderinclinably mounted upon said table, a piston reciprocal within saidcylinder, a hammer head extending from one end of said cylinder, areturn spring extending between said hammer head and said cylinder, ananvil also mounted upon said bed for supporting an associated drill bitto be dressed, adjacent said hammer head,anchoring means to preventlengthwise movement of said drill bit during dressing, and means toprovide relative transverse movement between said hammer head and thehead of said bit, said means including a pair of U brackets extendingupwardly from said table, sets of rollers mounted within said Ubrackets, a supporting tubular REFERENCES CITED The following referencesare of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 996,807 Smyth July 4, 1911.1,408,176 I-IDoubler Feb. 28, 1922 10 1,614,649 Butler Jan. 18, 19271,667,236 Bergquist Apr. 24, 1928 Worth Aug. 24, 1948

